Magnons in Ferromagnetic Metallic Manganites

Details Magnons in Ferromagnetic Metallic Manganites Magnons in Ferromagnetic Metallic Manganites

2007-08-21

arxiv.org/abs/0708.2891v1

Physics

Condensed Matter

Strongly Correlated Electrons

published in J. Phys.: Cond. Matt. 20 figures

Scientific paper

10.1088/0953-8984/19/31/315204

Ferromagnetic (FM) manganites, a group of likely half-metallic oxides, are of special interest not only because they are a testing ground of the classical doubleexchange interaction mechanism for the colossal magnetoresistance, but also because they exhibit an extraordinary arena of emergent phenomena. These emergent phenomena are related to the complexity associated with strong interplay between charge, spin, orbital, and lattice. In this review, we focus on the use of inelastic neutron scattering to study the spin dynamics, mainly the magnon excitations in this class of FM metallic materials. In particular, we discussed the unusual magnon softening and damping near the Brillouin zone boundary in relatively narrow band compounds with strong Jahn-Teller lattice distortion and charge/orbital correlations. The anomalous behaviors of magnons in these compounds indicate the likelihood of cooperative excitations involving spin, lattice, as well as orbital degrees of freedom.

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